plz help me in solving
Answers
Answer:
The weighted arithmetic mean is 50.2.
Step-by-step explanation:
Marks Obtained:-
20 - 30
So overall Marks obtained(xi)=(20+30)/2=50/2 = 25
fi=5
So fixi = 5×25=125
30 - 40
So overall Marks obtained(xi)=(30+40)/2 = 70/2=35
fi=10
fixi= 10×35 = 350
40 - 50
So overall Marks obtained(xi)=(40+50)/2 = 90/2 = 45
fi=09
fixi = 9×45 = 405
50 - 60
So overall Marks obtained(xi)=(50+60)/2 = 110/2 = 55
fi=12
fixi = 12×55 = 660
60 - 70
So overall Marks obtained(xi)=(60+70)/2 = 130/2 = 65
fi=8
fixi = 8×65 = 520
70 - 80
So overall Marks obtained(xi) = (70+80)/2 = 150/2 = 75
fi=6
fixi = 6×75 = 450
So Σfixi = 2510
Σfi=50
So weighted arithmetic mean = (Σfixi)/Σfi
= 2510/50
= 50.2
Ans:- The weighted arithmetic mean is 50.2.
Hope it helps you :D
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